CN114135392A - Engine thermal management system and method - Google Patents
Engine thermal management system and method Download PDFInfo
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- CN114135392A CN114135392A CN202111472091.5A CN202111472091A CN114135392A CN 114135392 A CN114135392 A CN 114135392A CN 202111472091 A CN202111472091 A CN 202111472091A CN 114135392 A CN114135392 A CN 114135392A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000007726 management method Methods 0.000 claims description 69
- 239000007789 gas Substances 0.000 claims description 16
- 230000004907 flux Effects 0.000 claims description 4
- 239000002912 waste gas Substances 0.000 claims description 4
- 230000008929 regeneration Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 abstract description 6
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 239000000446 fuel Substances 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
- F02B37/183—Arrangements of bypass valves or actuators therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1439—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1448—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an exhaust gas pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
Abstract
The invention provides an engine heat management system and a method, wherein the system comprises a heat management valve and an electric control bypass valve, the heat management valve is connected with a first exhaust manifold of an engine, and the electric control bypass valve is connected with a second exhaust manifold of the engine; the thermal management system further comprises an exhaust back pressure valve, and the exhaust back pressure valve is connected with the vortex end. The invention provides the energy of the compressor by the work of the engine combustion exhaust gas through the turbine of the turbocharger; and the closed-loop regulation of the turbine efficiency is realized by combining the fed back preswirl pressure signal and jointly regulating and controlling the designed heat management valve, the electric control bypass valve and the exhaust back pressure valve. The efficiency of the turbocharger of the engine is controlled and adjusted in a closed loop mode, the utilization efficiency of exhaust energy is improved, and the fuel economy is improved to a great extent.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine thermal management system and an engine thermal management method.
Background
The air intake and exhaust system of the diesel engine mainly comprises an exhaust manifold, a turbocharger and related pipelines, and mainly has the functions of utilizing the energy of the combustion waste gas of the engine to drive a compressor to pressurize the intake air and improve the intake air density.
In order to improve the economy of the engine and reduce the oil consumption, the utilization efficiency of the exhaust gas, namely the efficiency of the supercharger, is an important part, and besides the influence of the efficiency of the supercharger, the control of the engine on the efficiency of the supercharger is also an important part influencing the efficiency of the supercharger. In the existing stage, the control mode of the supercharger is gradually upgraded to an actively controlled electric bypass valve supercharger or even a variable-section turbocharger from a passively controlled bypass valve supercharger, but the closed-loop control of the supercharger is only based on the supercharging pressure for closed-loop control, so that the engine can operate in a low-efficiency area to achieve the target supercharging pressure, and the oil consumption of the engine is high.
Disclosure of Invention
The invention provides an engine thermal management system and method, which are used for solving the problem of high oil consumption of an engine caused by the existing boost pressure control of a supercharger.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an engine heat management system in a first aspect, which comprises a heat management valve and an electronic control bypass valve, wherein the heat management valve is connected with a first exhaust manifold of an engine, and the electronic control bypass valve is connected with a second exhaust manifold of the engine; the thermal management system further comprises an exhaust back pressure valve, and the exhaust back pressure valve is connected with the vortex end.
Further, the thermal management system further includes a pre-vortex pressure sensor disposed between the electronically controlled bypass valve and the second exhaust manifold.
Further, the heat management system further comprises an air inlet negative pressure sensor, an air inlet flow sensor and an air inlet temperature and pressure sensor, the air inlet negative pressure sensor is arranged at the front end of the air compressor, the air inlet flow sensor and the air inlet temperature sensor are arranged at the rear end of a supercharger, and the supercharger comprises the electronic control bypass valve.
Further, the intake air temperature sensor is connected to an intake manifold of the engine.
Further, the thermal management system also comprises an air inlet throttle valve, and the air inlet throttle valve is connected with the electric control bypass valve and used for controlling the exhaust temperature of the engine.
According to a second aspect of the invention, an engine thermal management method is provided, and based on the management system, the thermal management method comprises the following steps:
an electronic control bypass valve and a thermal management valve are respectively designed on two exhaust manifolds of an engine;
and the bypass flux of the waste gas of the supercharger, the exhaust pressure of an engine cylinder and the back pressure of the supercharger after vortex are correspondingly adjusted through an electric control bypass valve, a heat management valve and an exhaust back pressure valve respectively, so that the vortex end efficiency is adjusted.
Further, the thermal management method further comprises the steps of:
a vortex front pressure sensor is arranged in front of the electric control bypass valve, and vortex end efficiency adjustment of different vortex front pressures is carried out on the basis of pressure signals fed back by the vortex front pressure sensor.
Further, the thermal management method further comprises adjusting the end-pressing efficiency, and the specific process is as follows:
an air inlet negative pressure sensor is arranged in front of the air compressor, and an air inlet flow sensor and an air inlet temperature and pressure sensor are arranged on a pipeline behind the supercharger;
based on the gas compressor MAP, the pressure ratios corresponding to different gas inflow are obtained through the gas inlet negative pressure, the pressure after pressurization and the temperature signal, so that each working condition point is allowed to be in the optimal pressure end efficiency area.
Further, the heat management method further comprises the step of adjusting the exhaust temperature of the engine, and the specific process is as follows:
when the engine is in cold driving or the vehicle is in a cycle regeneration working condition, the exhaust temperature is adjusted through the exhaust backpressure valve, and auxiliary adjustment is performed through the electric control bypass valve, the air inlet throttle valve and the thermal management valve in sequence;
when the engine is in a long idling or high idling working condition, the exhaust temperature is adjusted through the air inlet throttle valve, and auxiliary adjustment is performed through the electric control bypass valve, the heat management valve and the exhaust back pressure valve in sequence.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
1. the exhaust heat management system comprises an exhaust manifold, a supercharger electric control bypass valve, an exhaust back pressure valve, a heat management valve, a vortex front pressure sensor and the like; the air inlet heat management system is composed of a supercharger compressor, an air inlet throttle valve, an air inlet negative pressure sensor, an air inlet flow sensor and the like. The engine combustion waste gas provides compressor energy by the work of a turbine of a turbocharger; and the closed-loop regulation of the turbine efficiency is realized by combining the fed back preswirl pressure signal and jointly regulating and controlling the designed heat management valve, the electric control bypass valve and the exhaust back pressure valve. The efficiency of the turbocharger of the engine is controlled and adjusted in a closed loop mode, the utilization efficiency of exhaust energy is improved, and the fuel economy is improved to a great extent.
2. The efficiency of the supercharger compressor is adjusted by the aid of signals fed back by front and rear sensors of the supercharger and exhaust heat management. Exhaust gas is introduced into the intake air through the thermal management valve to participate in combustion to reduce the amount of NOx generated during combustion. The exhaust temperature is adjusted through the air inlet throttle valve, the exhaust backpressure valve and the electric control bypass valve, so that the requirement of post-treatment exhaust temperature is met, different exhaust temperature control strategies under different working conditions are realized, and the influence on economy is minimum on the basis of realizing exhaust.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of the management system of the present invention;
FIG. 2 is a flow chart of an embodiment of the management method of the present invention;
in the figure, 1 engine, 10 intake manifold, 11 first exhaust manifold, 12 second exhaust manifold, 21 compressor, 22 vortex end, 23 electric control bypass valve, 3 exhaust back pressure valve, 4 heat management valve, 5 preswirl pressure sensor, 6 intercooler, 7 intake throttle valve, 8 intake flow sensor, 91 intake negative pressure sensor, 92 intake temperature pressure sensor and 93 intake temperature sensor.
Detailed Description
In order to clearly explain the technical features of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
As shown in fig. 1, an engine thermal management system according to an embodiment of the present invention includes a thermal management valve 4 and an electronically controlled bypass valve 23, where the thermal management valve 4 is connected to a first exhaust manifold 11 of an engine 1, and the electronically controlled bypass valve 23 is connected to a second exhaust manifold 12 of the engine 1; the thermal management system further comprises an exhaust back-pressure valve 3, and the exhaust back-pressure valve 3 is connected with a vortex end 22.
The adjustment of the bypass flux of the exhaust gas of the supercharger is realized by adjusting the opening of the electric control bypass valve 23; the thermal management valve 4 regulates the exhaust pressure of the cylinders of the engine 1; the back pressure of the supercharger after the vortex is adjusted by the opening degree of the exhaust back pressure valve 3, the expansion ratio (the pressure before the vortex/the exhaust back pressure valve) of the vortex end falls in a high-efficiency area of the MAP of the vortex end by controlling the three valves through the EC, and then the efficiency of the vortex end is adjusted, so that the optimal expansion ratio of the vortex end corresponding to the work amount of the vortex end required by the work done by the pressure end of the supercharger is obtained, and the efficiency of the vortex end is highest.
In one implementation manner of the embodiment of the present invention, the thermal management system further includes a pre-vortex pressure sensor 5, the pre-vortex pressure sensor 5 is disposed between the electronically controlled bypass valve 23 and the second exhaust manifold 12, and the vortex end efficiency is the highest when different pre-vortex pressures are realized based on a pressure signal fed back by the pre-vortex pressure sensor 5.
The electronic control bypass valve 23 is arranged in an exhaust passage in front of the supercharger vortex, and the electronic control bypass valve 23 is controlled by an electronic control proportional valve and an actuator or a direct current brushless motor; the thermal management valve 4 is a high-frequency switch valve and is controlled by an electric control proportional valve; when the bypass causes pressure imbalance of two channels to affect the performance of an engine and the efficiency of the supercharger, a thermal management valve 4 arranged on the other channel works, the adjustment of pressure balance of the two channels is realized by controlling the opening of the thermal management valve 4, and when the pressure before the turbine is fixed, the control of back pressure after the turbine is realized by finely adjusting a butterfly switch valve which cannot be controlled by a direct current motor, so that the adjustment of the expansion ratio on the turbine MAP is realized, and the turbine end works in an optimal efficiency area.
In one implementation manner of the embodiment of the present invention, the thermal management system includes adjustment of the efficiency of the compressor, and further includes an intake negative pressure sensor 91, an intake flow sensor 8, and an intake temperature and pressure sensor 92, where the intake negative pressure sensor 91 is disposed at the front end of the compressor 21, and the intake flow sensor 8 and the intake temperature sensor 93 are disposed at the rear end of the supercharger. The intake air temperature sensor 93 is connected to an intake manifold 10 of the engine 1. Based on the gas compressor MAP, the pressure ratios corresponding to different gas inflow are obtained through actually measured gas inlet negative pressure, pressure and temperature signals after pressurization, and each working condition point is allowed to be in an optimal pressure end efficiency area.
In one implementation manner of the embodiment of the invention, the thermal management system further comprises an air inlet throttle valve 7, and the air inlet throttle valve 7 is connected with the electric control bypass valve 23 and used for controlling the exhaust temperature of the engine.
Under the specific working condition of the engine, the exhaust temperature of the engine needs to reach a certain temperature to meet the emission requirement, the air inflow is adjusted by adjusting the opening of the air inlet throttle valve 7, the air-fuel ratio of the engine is small, the exhaust temperature is increased, the measure has the minimum influence on the economy, but the temperature is increased slowly. Under the working condition that the air inlet throttle valve 7 can not meet the requirement under the condition that the temperature needs to be quickly exhausted, the exhaust back pressure valve 3 can quickly raise the exhaust temperature and is used for cold start or other working conditions that the requirement cannot be met through the air inlet throttle valve 7; the heat management valve 4 and the electric control bypass valve 23 belong to fine adjustment exhaust temperature, the exhaust temperature is adjusted by adjusting the bypass amount of exhaust before the vortex, the exhaust temperature is mainly used as supplement for adjusting the exhaust temperature of the air inlet throttle valve 7 and the exhaust back pressure valve 3, and based on the cooperative adjustment, when the exhaust temperature meets the requirement, the influence on the economy of the engine is minimum.
As shown in fig. 2, an embodiment of the present invention further provides an engine thermal management method, based on the management system, the thermal management method includes the following steps:
s1, respectively designing an electric control bypass valve and a thermal management valve on two exhaust manifolds of the engine;
and S2, correspondingly adjusting the bypass flux of the exhaust gas of the supercharger, the exhaust pressure of an engine cylinder and the back pressure after the vortex of the supercharger through the electric control bypass valve, the heat management valve and the exhaust back pressure valve respectively, and adjusting the efficiency of the vortex end.
In one implementation manner of the embodiment of the method of the present invention, the thermal management method further includes:
a vortex front pressure sensor is arranged in front of the electric control bypass valve, and vortex end efficiency adjustment of different vortex front pressures is carried out on the basis of pressure signals fed back by the vortex front pressure sensor.
In an implementation manner of the embodiment of the method of the present invention, the thermal management method further includes adjusting the end-pressing efficiency, and the specific process includes:
an air inlet negative pressure sensor is arranged in front of the air compressor, and an air inlet flow sensor and an air inlet temperature and pressure sensor are arranged on a pipeline behind the supercharger;
based on the gas compressor MAP, the pressure ratios corresponding to different gas inflow are obtained through the gas inlet negative pressure, the pressure after pressurization and the temperature signal, so that each working condition point is allowed to be in the optimal pressure end efficiency area.
In one implementation manner of the embodiment of the method, the thermal management method further includes adjusting the exhaust temperature of the engine, and the specific process includes:
when the engine is in cold driving or the vehicle is in a cycle regeneration working condition, the exhaust temperature is adjusted through the exhaust backpressure valve, and auxiliary adjustment is performed through the electric control bypass valve, the air inlet throttle valve and the thermal management valve in sequence;
when the engine is in a long idling or high idling working condition, the exhaust temperature is adjusted through the air inlet throttle valve, and auxiliary adjustment is performed through the electric control bypass valve, the heat management valve and the exhaust back pressure valve in sequence.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (9)
1. The engine thermal management system is characterized by comprising a thermal management valve and an electronic control bypass valve, wherein the thermal management valve is connected with a first exhaust manifold of an engine, and the electronic control bypass valve is connected with a second exhaust manifold of the engine; the thermal management system further comprises an exhaust back pressure valve, and the exhaust back pressure valve is connected with the vortex end.
2. The engine thermal management system of claim 1, further comprising a pre-vortex pressure sensor disposed between the electronically controlled bypass valve and the second exhaust manifold.
3. The engine thermal management system of claim 1, further comprising an intake negative pressure sensor disposed at a front end of the compressor, an intake flow sensor and an intake temperature pressure sensor disposed at a rear end of a supercharger, the supercharger comprising the electronically controlled bypass valve.
4. The engine thermal management system of claim 3, wherein the intake air temperature sensor is coupled to an intake manifold of the engine.
5. The engine thermal management system of claim 1, further comprising an intake throttle valve coupled to the electronically controlled bypass valve for controlling engine exhaust temperature.
6. A method of thermal management of an engine, based on the management system of any one of claims 1 to 5, characterized in that it comprises the steps of:
an electronic control bypass valve and a thermal management valve are respectively designed on two exhaust manifolds of an engine;
and the bypass flux of the waste gas of the supercharger, the exhaust pressure of an engine cylinder and the back pressure of the supercharger after vortex are correspondingly adjusted through an electric control bypass valve, a heat management valve and an exhaust back pressure valve respectively, so that the vortex end efficiency is adjusted.
7. The engine thermal management method of claim 6, further comprising the step of:
a vortex front pressure sensor is arranged in front of the electric control bypass valve, and vortex end efficiency adjustment of different vortex front pressures is carried out on the basis of pressure signals fed back by the vortex front pressure sensor.
8. The engine thermal management method of claim 6, further comprising adjusting a tip-in efficiency by:
an air inlet negative pressure sensor is arranged in front of the air compressor, and an air inlet flow sensor and an air inlet temperature and pressure sensor are arranged on a pipeline behind the supercharger;
based on the gas compressor MAP, the pressure ratios corresponding to different gas inflow are obtained through the gas inlet negative pressure, the pressure after pressurization and the temperature signal, so that each working condition point is allowed to be in the optimal pressure end efficiency area.
9. The engine heat management method according to claim 6, further comprising adjusting an engine exhaust temperature by:
when the engine is in cold driving or the vehicle is in a cycle regeneration working condition, the exhaust temperature is adjusted through the exhaust backpressure valve, and auxiliary adjustment is performed through the electric control bypass valve, the air inlet throttle valve and the thermal management valve in sequence;
when the engine is in a long idling or high idling working condition, the exhaust temperature is adjusted through the air inlet throttle valve, and auxiliary adjustment is performed through the electric control bypass valve, the heat management valve and the exhaust back pressure valve in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111472091.5A CN114135392A (en) | 2021-12-02 | 2021-12-02 | Engine thermal management system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111472091.5A CN114135392A (en) | 2021-12-02 | 2021-12-02 | Engine thermal management system and method |
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| CN114135392A true CN114135392A (en) | 2022-03-04 |
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| CN202111472091.5A Pending CN114135392A (en) | 2021-12-02 | 2021-12-02 | Engine thermal management system and method |
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2021
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